Jawaharlal Nehru Technological University, Hyderabad
Jawaharlal Nehru Technological University, Hyderabad B.Tech I Year ENGINEERING CHEMISTRY Previous Question Paper (December - 2018 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
PART - A
Why hardness is expressed in terms of calcium carbonate equivalent?
Answer
Hardness is expressed in terms of calcium carbonate equivalent because its molecular weight is 100, which simplifies calculations. Additionally, it is the most insoluble salt that can be precipitated in water treatment processes.
Which salts are responsible for temporary and permanent hardness of water?
Answer
Temporary hardness is caused by bicarbonates of calcium and magnesium (Ca(HCO3)2 and Mg(HCO3)2). Permanent hardness is caused by chlorides and sulfates of calcium and magnesium (CaCl2, MgCl2, CaSO4, and MgSO4).
Why do electrochemical cells stop working after some time?
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Write a short note on calomel electrode.
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What is the functionality of a monomer?
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What are the applications of Bakelite?
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What are primary and secondary fuels?
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What is CNG? Why it is preferred over LPG?
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How is thermal conductivity of a refractory related to its porosity?
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What are the characteristics of good refractories?
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PART - B
Discuss the ion exchange process of softening hard water.
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What is Caustic embrittlement?
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What is potable water? What are the steps taken to obtain pure drinking water?
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Write the names of three sludge forming and three scale forming compounds.
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Describe the construction of lead - acid battery with the reactions occurring during discharge.
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Write short note on glass electrode.
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Distinguish between galvanic cell and a concentration cell.
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Write a short note on factors influencing e.m.f of batteries.
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Explain addition and condensation polymerisation with suitable examples.
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Write a short note on vulcanization process.
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What is chain polymerization and explain the steps involved?
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Classify conducting polymers with suitable example.
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Explain refining of petroleum.
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Why a good fuel must have low ash content?
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Explain ultimate analysis of coal.
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Define calorific value of fuel.
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Explain manufacture of cement in detail.
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Write any two types of refractories and their uses.
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Discuss four essential properties of a good refractory material.
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Write the classification of lubricants with example.
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